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(No Model.) 2 Sheets-Sheet 1.

G. HANCOCK. MACHINE FOR SHADING THE SURFACES 0P CALICO PRINTING ROLLS.No. 478,540. Patented July 5, 1892.

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(No Model.) 2 Sheets-Sheet 2.

G. HANCOCK. MAGHINB FOR SHADING THE SURFACES 0F CALICO PRINTING ROLLS.No. 478,540. Patented July 5, 1892.

wlTN E55 Es. NV ENTER- UNITED STATES Y PATENT OFFICE.

GEORGE HANCOCK, OF PROVIDENCE, RHODE ISLAND.

' MACHINE FOR SHADING THE SURFACES OF CALICO-PRINTING ROLLS.

SPECIFICATION forming part of Letters Patent No. 478,540, dated July 5,1892.

Application filed December 3, 1891. Serial No. 418,899. (No model.) 7

To all whom it may concern.-

Be it known that I, GEORGE HANoocK, a citizen of the United States,residing at Providence, in the State of Rhode Island, have invented anew and useful Improvement in Machines for Shading the Surfaces ofCalico- Printing Rolls, of which the following is a specification.

Heretofore the shading-mill in machines for producing the shading-groundupon the surface of calico-printing rolls has been itself engraved withthe entire shading efiect which is to be impressed upon the surface ofthe printing-roll, thus requiring a separately-engraved mill to produceeach of the various effects desired; and it is the object of myinvention to shade the printing-roll without first providing a shadedmill which is the counterpart of the desired shade upon the roll; and myinvention consists in the combination, with means for rotating theprintingroll, of the shadingmill adapted to press against the surface ofthe roll, and means for varying the depth of the action of the mill,whereby the desired shading effect may be produced upon the surface ofthe roll by means of a mill having its surface engraved with a singleuniform shading-ground, the desired variable effect being produced uponthe roll by the repeated rise and fall of the' mill when held againstthe surface of the roll, a single shading-mill being thus made capableof producing a great variety of shading effects.

Figure 1 represents an end elevation of my improved shadingmachine. Fig.2 represents a transverse section taken in the line 2 2 of Fig. 3. Fig.3 represents a rear elevation, Fig. 4 represents the opposite endelevation. Figs. 5 and 6 are detail views showing the construction ofparts for the machine. Fig. 7 represents a vertical section taken in theline 7 7 of Fig. 4,-showing an edge view of the shading-mill.

In the accompanying drawings, A represents the frame of the machine,Bthe copper printing-roll to be shaded, and Q the shadingmill. The roll Bis supported upon the shaft D, which is journaled in the bearings E E,and is rotated by means of the gear F, secured to the shaftD andengaging with the drivingpinion G upon the inner end of the cone-pulleyH, which turns loosely upon a fixed stud 1. Upon the bed J of the frameis placed the carriage K, which is held to slide upon the parallel waysa a, and to the carriage K is pivoted the lever L by means of the pin1), the outer arm of the said leverbeing provided with the notches c cfor holding the weight M and with a vertical slot adapted toreceive theconnecting-bar N, and also with the lateral perforation (Z for receivingthe bolt e, which serves to connect the bar N with the lever L, the saidbarN being provided with several perforations f, whereby the shadingmillQ may be adjusted in height to operate upon printing-rolls of diiferentdiameters.

The carriage K is provided with the upright standard 0, to the upper endof which is pivoted the lever P, and to the outer end of the lever P isjointed the connecting-bar N by means of the pivot-pin g. Between theears h h, at the under side of the lever P, is placed the hardened-steelshading-mill Q, having a'properly-engraved surfacet' for impressing theshading-surface upon the printingroll B, the said mill being arranged toturn loosely upon the pinj, which passes through the cars h h. Thecarriage K is driven along the ways a a of the bed J by means of thescrew R, which engages with a nut S, held by the downwardly-extendingarm of the carriage, and the said screw is rotated from the shaft D bymeans of the pinion T upon the shaft D, which engages with the gear Uupon the screw. Upon the shaft V, which is supported in the bearings H,is placed the gear W, which is connected with the gear F upon the shaftD by means of the intermediate gear X, which turns loosely upon anadjustable stud m, the said shaft V being provided with the spline n andthe sliding gear Y, which is adapted to move back and forth with thecarriage K, and at the same timerotate with the shaft V, the said gear Ybeing suitably held in a notch q, made in the said carriage and engagingwith the gear Z upon a shaft A, which is held in the bearings 0 0 at thelower end of the downwardly-projecting arms 10 p of the carriage K, andupon the shaft A, between the bearings 0 o, is placed the pattern-cam B,which may be of any required contour to produce the desired shadingeffect upon the surface of the roll B by causing the proper rise andfall of the shadingmill Q.

When the machine is set in operation, the roll B will be caused torotate under the shading-mill Q, which Will be pressed down upon thesaid roll by means of the Weight M, and the up-and-down movement of theshadingroller will be caused by the action of the cam B upon the end 7"of the lever L, and this operation of the cam will be continuouslyrepeated while the shading-mill Q is traversing the length of theprinting-roll B.

The gear W may be changed for others of different sizes, so as to drivethe pattern-cam B at any number of revolutions desired.

I claim as my invention- 1. In a machine for shading the surface ofcalico-printing rolls, the combination, with means for rotating theprinting-roll, of. the sliding carriage, the shading-mill supported uponthe sliding carriage and adapted to press against the surface of theroll, means for causing the traversing movement of the carriage, and thecam for raising and lowering the mill to produce the shading effect,substantially as described.

2. In a machine for shading the surface of calico-printing rolls, thecombination, With the roll-supporting mandrel D and means for rotatingthe same, of the sliding carriage K, the screw R and nut S for causingthe traverse of the carriage, the shading-mill Q, the lever P, carryingthe shading mill, the Weighted lever L, connected with the lever P, thepattern-cam B, adapted to actuate the lever P, and the connecting-gearsfor operating the cam, substantially as described.

GEORGE HANCOCK.

Witnesses:

S. SoHoLFIELD, CHARLES F. SOHMELZ.

